Could you explain me why you say that? I looked up the difference between Venn and Euler diagrams here: http://en.wikipedia.org/wiki/Venn_diagram#Overview , but I can’t really find the rule why this particular one should be called a Euler one. Is it just because in a Venn diagram you may have an overlapping zone between the two sets but shaded as “empty”, while a Euler diagram would have it just missing? If it is so, then I think that this particular configuration of the diagram as here presented doesn’t, although unorthodox, doesn’t give you a chance to say that is should be called a Euler diagram.

Wow, I really must learn more about data (and Idea, otherwise Steve may get mad) visualization, as I had this concept at the center of my explanation of my privacy settings on Facebook and Twitter to my friends and colleagues for quite sometime but never could think of just jotting down a doodle like this. This art empowers you.